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参数资料
| 型号： | MAX8686EVKIT+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 19/23页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR MAX8686 |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 0.7 V ~ 5.5 V |
| 电流 - 输出： | 25A |
| 输入电压： | 4.5 V ~ 20 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 300kHz ~ 1MHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | MAX8686 |
Single/Multiphase, Step-Down,
DC-DC Converter Delivers Up to 25A Per Phase
ripple-current requirement (I RMS ) imposed by the
switching currents as defined by the following equations:
where I 2OUT_MAX and I 2OUT_MIN are the initial and final
values of the load current during the worst-case load
dump, V INIT2 is the voltage prior to the load dump, V FIN
I RMS = D × I OUT _ MAX ×
for (N x D) ≤ 1:
1
N × D
? 1
is the steady-state voltage after the load dump, and
V OV is the allowed voltage overshoot above V FIN . The
term (V FIN + V OV ) represents the maximum transient
output voltage reached during the load dump. The
above equation is an approximation, and the output
I RMS = D × I OUT _ MAX ×
3
N × D
?
2
( N × D )
2
? 1
capacitance value obtained serves as a good starting
point. The final value should be obtained from actual
measurements. For ceramic output capacitors, the out-
for (N x D) > 1.
where N is the number of phases, D is the duty cycle,
and I OUT_MAX is the maximum output current.
Use the minimum input voltage for calculating the duty
cycle to obtain the worst-case input-capacitor RMS rip-
ple current. Low-ESR aluminum electrolytic, polymer, or
ceramic capacitors should be used to avoid large volt-
age transients at the input during a large step load
change at the output. The ripple-current specifications
provided by the manufacturer should be carefully
put capacitor requirement is determined mostly by load
dump requirements due to their low ESR and ESL. See
Figures 7 and 8.
Compensation Design
The MAX8686 uses an internal transconductance error
amplifier whose output compensates the control loop.
The external inductor, output capacitor, compensation
reviewed for temperature derating. Additional small-
value, low-ESL ceramic capacitors (1μF to 10μF with
proper voltage rating) can be used in parallel to reduce
any high-frequency ringing.
POWER
MODULATOR
GAIN
(dB)
CLOSED LOOP
ERROR
AMPLIFIER
Output Capacitor
f C
The minimum output capacitance, C OUT(MIN) , is
required to meet load-dump requirements. The worst-
case load dump is a sudden transition from full load
current (I 2 OUT_MAX ) to minimum load current
(I 2OUT_MIN ). C OUT(MIN) is estimated based on energy
0
VOLTAGE-
DIVIDER
fp MOD
fz MOD
FREQUENCY (Hz)
balance from:
(
× I OUT _ MAX OUT _ MIN
? I
C OUT ( MIN ) ≥
L
N
2 2
( V FIN + V OV ) 2 ? V INIT 2
)
Figure 7. Simplified Gain Plot for the fzMOD > fC Case
CLOSED LOOP
GAIN
COMP
R C
C F
POWER
MODULATOR
(dB)
ERROR
AMPLIFIER
MAX8686
C C
0
VOLTAGE-
fp MOD
fz MOD
f C
FREQUENCY (Hz)
DIVIDER
Figure 6. Compensation Components
Figure 8. Simplified Gain Plot for the fzMOD < fC Case
______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8686EVKIT# | 功能描述:电源管理IC开发工具 MAX8686 Eval Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MAX8686EVKIT+ | 功能描述:电源管理IC开发工具 MAX8686 Eval Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MAX8687ETL+ | 制造商:Maxim Integrated Products 功能描述:SINGLE /MULTIPHASE, DC/DC CONVERTER - Rail/Tube |
| MAX8688AHETG+ | 功能描述:电流和电力监控器、调节器 Digital Power-Supply Controller/Monitor RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
| MAX8688AHETG+T | 功能描述:电流和电力监控器、调节器 Digital Power-Supply Controller/Monitor RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
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